My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
FLOOD11628 (2)
CWCB
>
Floodplain Documents
>
DayForward
>
1100
>
FLOOD11628 (2)
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/26/2010 10:25:17 AM
Creation date
1/5/2009 12:18:10 PM
Metadata
Fields
Template:
Floodplain Documents
County
El Paso
Community
Manitou Springs, Colorado Springs
Basin
Arkansas
Title
Paleohydrologic Flood Investigations for Streams in Manitou Springs and Colorado Springs
Date
12/3/1987
Floodplain - Doc Type
Floodplain Report/Masterplan
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
36
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
Uniortunately photographa taken are too dark becauee of poor lighting <br />under the denae vegetation in the narrow canyons. Several years ago <br />pale~flood inveatigation were made in e number of Rampart Range stream <br />channela north af Fountain Creek that are tributary to Monument Creek; <br />theee results are also summari2ad here. <br />Onsite Paleoflood Investigation~ <br />Camn Creek <br />Camp Creek ~oins Fountain Creek at an elevation of about 6,100 <br />feet, however investigations Qtarted at the east road into Garden of <br />the Goda at an elevetion of 6,350 feet. The drainage area here is <br />estimated (so noted if visually estimated from topographic mape) to be <br />10 ~quare miles. Most expoaed eteep slopea at this elevation and <br />lower have e~tensive rill and gully eroeion indicating intense rain is <br />~mmon. Scoured and unvegetated banks indicate a recent (.within the <br />laet 2 t~ 3 years) flow with a width of 15 feet and depth of 3 feet <br />indicating a recent pealc dischax~e of about 450 cubic feet per second. <br />Flood terraces from a maximum f:Lood are about 100 feet apart and their <br />tope are about S feet ebove ~he gtreambed euggesting a maximum peak <br />discharge of 5,0@0 cubic feet per second. <br />Upstream from Glen Eyrie, at an elevation 6,550 feet, the channel <br />ahowa evidence ot recent flooding as well ae large boulder bars from <br />older floods. The channel contains many rounded and polished boulders <br />up to 2 feet in diame~er that have been moved by floods. Flc~od debris <br />ie lo~ged upstream from obatructions. There is no moss or lichen <br />growin~ within 3 feet of thz st•reambed. This basin has gret potential <br />for detailed paleohydrologir investigation as it is virtually <br />undisturbed and haa unique palz~~flood ~eposits (02 the largesots floods <br />in the study area). <br />About 1/4 mile upstream fr~~m Glen Eyrie, the canyon conctricts to <br />about 30 feet and the etreambr~d is scoured from wall to wal.l. At an <br />elevation of 6,700 feet floo~ debris, tree scars, indicat~ a medium <br />flood (about 25 years years ago) of about 3 foot depth. The channel <br />Width averagea 30 feet. Assuming a mean flood velocity of le~ f'eet per <br />second, the flood discharge was about 900 cubic feet per second. <br />At several locations, although moet predominant at an elevation <br />of 6,750 feet, both banks have a 50 foot long and 20 foot wide flood <br />bars. The bar is covered with many large boulders and ~;ts top is <br />about 10 feet above the bedrock atreambed. The width of tYie channel <br />is 4O feet. Aseuming a mean flood velocity of 10 feet per sEacond, the <br />rlood that deposited these sediments had a peak discharge of <br />approximately 4000 cubic feet per second. The boulders on the flood <br />bar were nearly completely covered with lichen and moes (as were the <br />bedrock valley walls above the top of the flood bar). There were <br />several large apruce trees (which generally start growing shortly <br />after the flood) with diametere of 4 feet growing on top of the flood <br />bars. It is estimated that these trees probably are 200 to 250 years <br />old. There is no other higher flood deposits along thea channel. <br />Because of the remoteness of this basin, time did not allow hiking up <br />.S'. <br />
The URL can be used to link to this page
Your browser does not support the video tag.